big four construction hazards: electrical hazards this material was produced under grant number...
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Big Four Construction Hazards:Electrical Hazards
This material was produced under grant number 46F5-HT03 and modify under grant number SH-16596-07-60-F-72, both from the Occupational Safety and Health Administration, U.S. Department of Labor. It does not necessarily reflect the views or policies of the U.S. Department of Labor, nor does mention of trade
names, commercial products, or organizations imply endorsement by the U.S. Government.
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Sponsor
United States Department of LaborOccupational Safety and Health Administration
OSHA
Susan Harwood Grant#SH-16596-07-60-F-72
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Working Team
UNIVERSITY OF PUERTO RICO MEDICAL SCIENCES CAMPUS
Graduate School of Public Health, Dep. of Environmental Health
Sergio Caporali, Ph.D., CSP – Principal Investigator
Lida Orta-Anés, Ph.D., Field TrainerMarcilyn Colón Colón, MSc., Training Coordinator
Harlyn Rivera, Administrative Assistant
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Working Team
CONTRACTORS
Circe E. Niezen, ME, MBA, Training Evaluator, PUPRMark Fullen, Ph.D. Candidate, Field Trainer and Curriculum
Developer, WVUCarmen Vázquez, RN, Field Trainer
Migdalia Ruiz, MS, Field TrainerCarlos Ortiz, Ph.D., Online Training Administrator, UPR-CPRS-OIRE
Eliel Melón Ramos – Online Training Adm. Assistant, UPR-CPRS-OIRE
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Introduction
The following presentations have been developed in both Spanish and English for the construction industry. These presentations focus on the Big Four Construction Hazards – falls, electrical, caught-in, and struck-by.
All training materials will cover the four hazards seen regularly on construction sites and will focus on the methods for the recognition and the prevention of these common hazards.
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Electrical Hazards - Overview
A. Electrical Hazards – What is Electricity?1. Improper Grounding2. Exposed Electrical Parts3. Inadequate Wiring4. Damaged Insulation5. Overloaded Circuits
6. Damaged Tools & Equipment7. Wet Conditions8. Overhead Power Lines
B. Accident Prevention: 1. Personal Protective Equipment2. Inspect Tools & Cords3. GFCIs4. Lock-Out/Tag-Out
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Electrical Hazards
Electrical hazards are one of the greatest hazards on a construction sites. (Electrocution can be a result of an electrical hazard).
This program will help you recognize common electrical hazards.
The symbols will tell you if the situation in the picture is either safe or not safe.
SafeSafe
Not safeNot safe
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Electrical Hazards Statistics
Each year workers die from contacting electric current. During the year 2006:
• 247 workers died after contacting electric current.
• 124 were construction workers.
• Nearly 4.5% of all deaths in 2006 resulted from electrocutions.
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What is Electricity?
Electricity is a natural energy force.
Electricity is also a man made energy force.
It is essential to modern life and taken for granted everyday.
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What is Electricity?
Electricity flows through conductors.
Conductors include: metals, water, the Earth and the human body.
Electricity must have a complete circuit or path to flow.
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How Electricity Works
When electrical tools are working properly a complete circuit is maintained between the tool and the energy source.
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How Electricity Works
However, if the tool is damaged, the person may come in contact with the electricity and can become a path for the current.
The person will be shocked!
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How Electricity Works
However, if the tool is damaged, the person may come in contact with the electricity and can become a path for the current.
The person will be shocked!
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Electrical Hazards
Improper grounding Exposed electrical parts Inadequate wiring Overhead power lines
Damaged insulation Overloaded circuits Wet conditions Damaged tools and
equipment
The following is a list of common electrical hazards found on construction sites:
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Improper Grounding
Grounding is the process used to eliminate unwanted current.
A ground is a physical electrical connection to the earth.
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Improper Grounding
Electrical equipment must be properly grounded.
Grounding reduces the risk of being shocked, burned or electrocuted.
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Improper Grounding
The ground pin safely returns leakage current to ground.
Never remove the ground pin.
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Improper Grounding
Removing the ground pin removes an important safety feature.
You can get shocked!
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Exposed Electrical Parts
Exposed wires or terminals are hazardous.
Report these conditions to your supervisor.
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Exposed Electrical Parts
This electrical panel has missing circuit breakers.
Never use a panel that has exposed wires.
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Exposed Electrical Parts
All openings must be closed.
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Exposed Electrical Parts
Outer insulation on electrical cords must be intact.
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Exposed Electrical Parts
On construction sites, temporary lighting must be properly guarded and protected to avoid contact with broken bulbs and avoid potential shocks.
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Inadequate Wiring
Use properly rated extension cords.
Make sure your power tools are being used with a properly rated extension cord.
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Inadequate Wiring
DIFFERENT TYPES OF WIRES WITH THEIR ELECTRICAL CURRENT RATING
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Damaged Insulation
Defective or inadequate insulation is a hazard.
Insulation prevents conductors from contacting each other or you.
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Damaged Insulation
Never attempt to repair a damaged cord with tape.
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Damaged Insulation
Never use tools or extension cords with damaged insulation.
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Damaged Insulation
Never hang extension cords from nails or sharp objects.
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Damaged Insulation
Do not run extension cords through doors or windows.
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Overloaded Circuits
Overloaded circuits can cause fires.
Use proper circuit breakers.
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Overloaded Circuits
Never overload an outlet.
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Overloaded Circuits
Do not use power strips or surge protectors on construction sites.
Instead, use a 3-way extension with a GFCI.
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Damaged Tools and Equipment
Do not use electric tools that are damaged.
You may receive a shock or be electrocuted.
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Damaged Tools and Equipment
Double insulated tools are labeled.
It will be marked “Double Insulated”.
It will have the following symbol:
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Wet Conditions
Damp, wet or humid conditions are very hazardous while working with electricity.
Damaged insulation increases the hazard.
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Wet Conditions
Always avoid using tools in wet, rainy or very humid locations.
Water increases the risk of electric shock.
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Unsafe Distance from Overhead Power Lines
Survey the site for overhead power lines.
Never store materials or equipment under overhead power lines.
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Unsafe Distance from Overhead Power lines
Maintain a distance of at least 10’ between tools and equipment and overhead power lines.
Power lines greater than 50 kV require greater distances.
Shocks and electrocutions occur where physical barriers are not in place to prevent contact with the wires.
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Unsafe Distance from Overhead Power lines
Maintain safe distances between scaffolding and overhead power lines.
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Unsafe Distance from Overhead Power lines
Overhead power lines are very dangerous.
Never attempt to contact an overhead power line.
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Accident Prevention
A willing, positive attitude towards safety will help make a safer work environment.
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Accident Prevention Always consider these safety
precautions: • Personal protective equipment
(PPE)• Use proper grounding • Use properly sized circuit
breakers• Guard live electrical parts• Use properly flexible cords• Inspect tools, wiring, circuits
and electrical systems. Use if in good working condition ("Do not overload circuits".)
• Ground fault circuit interrupters (GFCIs)
• Have the utility company de-energize over head power lines and ground the lines.
• Lock-out/tag-out• Close electrical panels
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Personal Protective Equipment (PPE)
PPE for electrical hazards include:• hardhats • rubber or insulating
gloves rated for the electrical hazards at the worksite.
• insulating clothing
NEVER use damaged PPE!
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Personal Protective Equipment (PPE)
Use appropriate rubber insulating gloves.
Make sure the gloves fit properly.
Make sure the glove rating matches with the work to be performed.
Not all gloves can be used to prevent electric shock.
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Personal Protective Equipment (PPE)
Hard hats offer protection.
Hard hats are rated for certain uses.
Metal hard hats SHOULD NOT be used when working close to electrical lines.
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Inspect Tools and Cords
Inspect tools and cords completely before using for:• cracks• damaged insulation• broken ground pins• frayed line cord• loose parts• any other damage
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GFCI
OSHA requires the use of GFCIs on all construction sites.
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GFCI
A GFCI is a fast-acting circuit breaker.
It senses small imbalances in the circuit caused by current leakage to ground.
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GFCI
It continually matches the amount of current coming and going to an electrical device.
The GFCI looks for a difference of approximately 5 milliamps.
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Lock-out/Tag-out
Workers must ensure electricity is off and “locked-out” before work is performed.
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Lock-out/Tag-out
Once the on/off switch is securely locked out:• the switch must
be tagged.• The tag lets
others know why the switch is off.
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Lock-out/Tag-out
Locks and tags are warning signs.
You must be trained in lock-out/tag-out procedures.
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Disclaimer/Usage Notes
Photos shown in this presentation may depict situations that are not in compliance with applicable OSHA requirements.
It is not the intent of the content developers to provide compliance-based training in this presentation, the intent is more to address hazard awareness in the construction industry, and to recognize the overlapping hazards present in many construction workplaces.
It should NOT be assumed that the suggestions, comments, or recommendations contained herein constitute a thorough review of the applicable standards, nor should discussion of “issues” or “concerns” be construed as a prioritization of hazards or possible controls. Where opinions (“best practices”) have been expressed, it is important to remember that safety issues in general and construction jobsites specifically will require a great deal of site - or hazard-specificity - a “one size fits all” approach is not recommended, nor will it likely be very effective.
It is assumed that individuals using this presentation, or content, to augment their training programs will be “qualified” to do so, and that said presenters will be otherwise prepared to answer questions, solve problems, and discuss issues with their audiences.
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Disclaimer/Usage Notes
No representation is made as to the thoroughness of the presentation, nor to the exact methods of recommendation to be taken. It is understood that site conditions vary constantly, and that the developers of this content cannot be held responsible for safety problems they did not address or could not anticipate, nor those which have been discussed herein or during physical presentation. It is the responsibility of each employer contractor and their employees to comply with all pertinent rules and regulations in the jurisdiction in which they work. Copies of all OSHA regulations are available from your local OSHA office. This presentation is intended to discuss Federal Regulations only – your individual State requirements may be more stringent.
As a presenter, you should be prepared to discuss all of the potential issues/concerns, or problems inherent in those photos particularly.
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Big FourConstruction Hazards:
Electrical Hazards
This concludes theElectrical Hazards Module
“The End”